Why do paper salad boxes burst?

There are several reasons why paper salad boxes may burst. First, if the salad in the box contains ingredients with high temperature or high humidity, such as hot soup or hot vegetables, it will cause steam to be generated inside the box, increasing the internal pressure and causing the box to burst. Secondly, if the material of the box is not strong enough or has flaws, it may burst when under pressure. In addition, if it is squeezed or bumped during transportation, it may also cause the box to burst. Therefore, when choosing to use a paper salad box, pay attention to the temperature and humidity of the ingredients, as well as the quality and transportation method of the box to avoid bursting.